Change page margins:
1. Go to the Layout tab and select Margins.
2. Select a predefined option - Normal, Narrow, Moderate, Wide.
Set default margins
You can change the default settings, which will be used for any new documents.
1. Go to Layout > Page Setup.
2. Select a predefined option - Normal, Narrow, Moderate, Wide - or
Select Layout > Page Setup to set custom margins.
3. Select Set as Default.